"If you are taking this product use it as A. Last resort and B. Take only one pill and if you do not get the desired effect then take another. 
I have severe constipation and when I take one pill I will pass the hard stool and a little more, but will not have diarrhea. 
If I take more than one then I will have severe cramping and I will have diarrhea after passing the hard stool. 
For me it takes anywhere from 3-6 hours to kick in and from the point where I start the bm it will last up to 5 hours. I usually clean out my bowel before that point but the cramps continue. If the pain is really bad I will actually take peptobismol or tums for my stomach pain."